Lets take a look at each one and break down what they do best
Face value, a 2/3 Deathtouch is worth at least two mana and an Impulse the same
Legendary Creature Enchantment - Druid Snake Viconia, Drow Apostate At the beginning of your upkeep, if there are four or more creature cards in your graveyard, return a creature card at random from your graveyard to your hand
Bloodshot Cyclops a good inclusion for decks that run large creatures and ones that can benefit from having a sacrifice outlet
Look at Nefarox, now back at me, now back at Nefarox, now back to me
Given how prevalent scrying and surveil mechanics are for the color, being able to draw after every single activation is an excellent way to get even more value from great cards